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- EXECUTING A WORD
-
- At it's core, executing a word is pushing the wordref on PS and
- calling EXECUTE. Then, we let the word do its things. Some
- words are special, but most of them are of the compiledWord
- type, and that's their execution that we describe here.
-
- First of all, at all time during execution, the Interpreter
- Pointer (IP) points to the wordref we're executing next.
-
- When we execute a compiledWord, the first thing we do is push
- IP to the Return Stack (RS). Therefore, RS' top of stack will
- contain a wordref to execute next, after we EXIT.
-
- At the end of every compiledWord is an EXIT. This pops RS, sets
- IP to it, and continues.
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